2D Blender how do I make objects move with frames?
While in Grease pencil draw mode when you edit over frames a new keyframe is automatically created, 3D objects (like your text object) have to explicit the keyframe insertion. This can be done pressing I to insert  a keyframe, or, automatically, enabling the little dot icon (record auto keying) on the left of the centered play buttons in the timeline window (at the very bottom of your screenshot).